Display screen with a transitional graphical user interface



FIG. 1 is a front view of a first image in a sequence for a display screen with a transitional graphical user interface; and,

FIG. 2 is a front view of a second image thereof.

The broken line showing of a display screen and device in all views are for the purpose of illustrating environment and forms no part of the claimed design. The broken lines of text, numbers, icons, and boxes demonstrating portions of a graphical user interface displayed on the display screen in all views and form no part of the claimed design. The areas filled in with pixels illustrate contrasting appearance, within parts in all views of the graphical user interface displayed on the display screen, and form a part of the claimed design. The areas filled in with diagonal fill lines illustrate contrasting appearance of the background fill, within parts in all views of the graphical user interface displayed on the display screen, and form a part of the claimed design.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1-2. The process or period in which one image transitions to another forms no part of the claimed design. 

CLAIM The ornamental design for a display screen with a transitional graphical user interface, as shown and described. 